/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "nbrToCell.H"
#include "polyMesh.H"

#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{

defineTypeNameAndDebug(nbrToCell, 0);

addToRunTimeSelectionTable(topoSetSource, nbrToCell, word);

addToRunTimeSelectionTable(topoSetSource, nbrToCell, istream);

}


Foam::topoSetSource::addToUsageTable Foam::nbrToCell::usage_
(
	nbrToCell::typeName,
	"\n    Usage: nbrToCell <nNeighbours>\n\n"
	"    Select all cells with <= nNeighbours neighbouring cells\n\n"
);


// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

void Foam::nbrToCell::combine(topoSet& set, const bool add) const
{
	const cellList& cells = mesh().cells();
	const polyBoundaryMesh& patches = mesh_.boundaryMesh();

	boolList isCoupled(mesh_.nFaces()-mesh_.nInternalFaces(), false);

	forAll(patches, patchI)
	{
		const polyPatch& pp = patches[patchI];

		if (pp.coupled())
		{
			label faceI = pp.start();
			forAll(pp, i)
			{
				isCoupled[faceI-mesh_.nInternalFaces()] = true;
				faceI++;
			}
		}
	}

	forAll(cells, cellI)
	{
		const cell& cFaces = cells[cellI];

		label nNbrCells = 0;

		forAll(cFaces, i)
		{
			label faceI = cFaces[i];

			if (mesh_.isInternalFace(faceI))
			{
				nNbrCells++;
			}
			else if (isCoupled[faceI-mesh_.nInternalFaces()])
			{
				nNbrCells++;
			}
		}

		if (nNbrCells <= minNbrs_)
		{
			addOrDelete(set, cellI, add);
		}
	}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

// Construct from components
Foam::nbrToCell::nbrToCell
(
	const polyMesh& mesh,
	const label minNbrs
)
:
	topoSetSource(mesh),
	minNbrs_(minNbrs)
{}


// Construct from dictionary
Foam::nbrToCell::nbrToCell
(
	const polyMesh& mesh,
	const dictionary& dict
)
:
	topoSetSource(mesh),
	minNbrs_(readLabel(dict.lookup("neighbours")))
{}


// Construct from Istream
Foam::nbrToCell::nbrToCell
(
	const polyMesh& mesh,
	Istream& is
)
:
	topoSetSource(mesh),
	minNbrs_(readLabel(checkIs(is)))
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::nbrToCell::~nbrToCell()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::nbrToCell::applyToSet
(
	const topoSetSource::setAction action,
	topoSet& set
) const
{
	if ((action == topoSetSource::NEW) || (action == topoSetSource::ADD))
	{
		Info<< "    Adding cells with only " << minNbrs_ << " or less"
				" neighbouring cells" << " ..." << endl;

		combine(set, true);
	}
	else if (action == topoSetSource::DELETE)
	{
		Info<< "    Removing cells with only " << minNbrs_ << " or less"
				" neighbouring cells" << " ..." << endl;

		combine(set, false);
	}
}


// ************************************************************************* //
